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首页> 外文会议>2004 Water quality technology conference and exposition (2004 WQTC) >FORMATION AND DECAY OF THMS AND HAASIN FIVE FULL-SCALE DISTRIBUTION SYSTEMS
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FORMATION AND DECAY OF THMS AND HAASIN FIVE FULL-SCALE DISTRIBUTION SYSTEMS

机译：THMS和Haasin五个全尺寸分配系统的形成和衰减

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摘要

With the promulgation of the future Stage 2 Disinfectants and Disinfection By-Product Rulern(DBPR), utilities are facing the challenge of having to revisit the selection of their distributionrnsystem monitoring sites to capture locations with maximum trihalomethane (THM) andrnhaloacetic acid (HAA) concentrations.rnThis AwwaRF and USEPA sponsored research study investigated factors affecting the formationrnand decay of disinfection by-products (DBPs) under actual distribution system conditions. Fullscalerndistribution system samplings were conducted over a one-year period at two freernchlorinated systems and two chloraminated systems. In addition, one chloraminated system, withrnperiodical switches to free chlorine for nitrification control, was closely monitored before,rnduring, and after the disinfectant change. Monitoring parameters included the four THMsrn(THM4), the nine HAAs (HAA9) and N-nitrosodimethylamine (NDMA), along with a suite ofrngeneral water quality parameters. This manuscript presents THM4 and HAA9 results obtained atrnthe participating utilities, and a discussion of observed factors affecting the formation and decayrnof DBPs in full-scale distribution systems.rnAs expected, THM4 and HAA9 concentrations were higher in the warmer months than in therncolder months in both free chlorinated and chloraminated systems. In the free chlorinatedrnsystems, THM4 concentrations increased as water age increased and chlorine residual decreased,rna trend observed for all samplings. Moreover, with the increase in water age and a decrease inrnchlorine residual, HAA9 concentrations generally increased or remained constant except atrnsampling locations with the highest water age, where a decrease in HAA9 concentrations
机译：随着未来第二阶段消毒剂和消毒副产品规则（DBPR）的颁布，公用事业公司面临着必须重新选择其分销系统监控站点以捕获具有最高三卤甲烷（THM）和甲基卤乙酸（HAA）浓度的位置的挑战。这个由AwwaRF和USEPA赞助的研究研究了在实际分配系统条件下影响消毒副产物（DBP）形成和衰减的因素。在一年的时间里，在两个自由氯化系统和两个氯化系统中进行了全规模分配系统采样。此外，在更换消毒剂之前，期间和之后，还密切监视了一个氯化系统，该系统定期切换为游离氯以进行硝化控制。监测参数包括四个THMsrn（THM4），九个HAA（HAA9）和N-亚硝基二甲胺（NDMA），以及一整套常规水质参数。这份手稿介绍了在参与的公用事业部门获得的THM4和HAA9结果，并讨论了影响全比例分布系统中形成和衰变的DBP的观察因素。正如预期的那样，在较温暖的月份，THM4和HAA9的浓度均高于在较冷的月份免费的氯化和氯化系统。在自由氯化系统中，THM4浓度随水龄的增加和氯残留量的减少而增加，所有样品均观察到RNA趋势。此外，随着水龄的增加和水中残留残留氯的减少，除了水龄最高的取样地点（HAA9浓度降低）外，HAA9浓度通常会升高或保持恒定。

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